Resonant sonic toothbrush

Abstract

The invention discloses a resonant sonic toothbrush for preventing the phenomenon that the main shaft of a resonant sonic toothbrush may not rotate. A permanent magnet assembly comprises a magnetic core and a magnet, wherein the magnetic core is fixed on the main shaft; at least two slots are formed in the circular array on the outer wall of the magnetic core; and two magnets are arranged in each slot, the N pole of one magnet is arranged outward along the radial direction of the main shaft, and the S pole of the other magnet is arranged outward along the radial direction of the main shaft. According to the toothbrush, two magnets with opposite magnetic poles are arranged in one slot in the magnetic core, the magnetic field generated by a stator winding is attractive to one magnet and is repellent to the other magnet, a torque is naturally formed to drive the main shaft to rotate, unstable balance point cannot occur, and the reciprocating rotation of the main shaft can be relatively stable.

Description

technical field [0001] The invention relates to the field of personal care products, in particular to a resonant sound wave toothbrush. Background technique [0002] Sonic toothbrush is a new type of toothbrush that combines sound wave technology in oral care. The toothbrush head vibrates according to the designed frequency to generate ultrasonic frequency vibration with sound waves as energy to achieve the purpose of cleaning teeth. [0003] The invention patent of authorized notification number CN205336076U discloses a high-frequency resonant oscillator for toothbrushes, including coil windings, housings, spindles, permanent magnet components, and excitation signals in the form of alternating currents are applied to coil windings and generate N An electronic control device for high-frequency conversion between poles and S poles. The coil windings are distributed around the periphery of the permanent magnet assembly; the alternating current of the coil windings changes at h...

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Problems solved by technology

[0004] Compared with the traditional eccentric wheel, turbine and other mechanisms, the above-mentioned patent has higher efficiency and lower noise, but the polarity arrangement of the permanent magnet assembly is single. When the center of the magnetic force line of the coil winding coincides with the center of the magnetic force line of the permanent magnet assembly, the permanent magnet assembly At this time, it is in an unstable equilibrium point, and the magnetic pole of the coil winding may change but the permanent magnet assembly does not rotate; moreover, the magnetic field lines of the coil winding are open, the phenomenon of magnetic flux leakage is serious, and the coil winding will consume more electric energy

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